Arcana Collectors
Some people don't just learn things. They hoard the weird stuff.
There's a type of person who doesn't just read a lot or know a lot. They collect arcana. Obscure, esoteric, often useless knowledge that most people don't even know exists, let alone care about. And they do it compulsively, across decades, with a hunger that looks a lot like addiction.
I'm not talking about trivia people. Trivia is bar night stuff -- who played the detective in that movie, what year did such-and-such happen. Arcana is different. Arcana is the guy who knows the specific trade routes that carried cinnamon from Sri Lanka to Venice in the 14th century, and why that matters for understanding the fall of Constantinople. It's knowledge that connects to other knowledge in ways that aren't obvious until someone connects them for you.
Some people are very, very good at this.
Umberto Eco's Anti-Library
Eco owned around 30,000 books. He hadn't read most of them. When visitors would gawk at his shelves and ask how many he'd read, he'd get annoyed. The whole point was the unread books. He called it an "anti-library" -- a monument to everything he didn't yet know.
That's a flex disguised as humility, and I respect it.
Eco was a semiotician by trade, which is a fancy way of saying he studied signs and symbols and how meaning gets made. But his real skill was hoarding medieval arcana and then weaving it into fiction. The Name of the Rose is a murder mystery set in a 14th-century monastery, and it's packed with so much obscure knowledge about monastic life, heretical movements, and Aristotelian philosophy that you can't tell where the research ends and the invention begins. That's the mark.
The man collected knowledge the way some people collect stamps -- except the stamps were about alchemy and forgotten heresies and the semiotic structure of comic books. All at once. Without apparent hierarchy.
John Dee
If Eco was the modern archetype, John Dee was the original.
Dee was Queen Elizabeth I's court advisor, mathematician, astronomer, and -- this is where it gets good -- occultist. He owned the largest private library in Elizabethan England. Over 4,000 volumes, which in the 1500s was absolutely insane. Most universities didn't have that many.
But Dee didn't just collect books about math and navigation (though he did, and he essentially invented the concept of the British Empire as a naval power). He also collected books about talking to angels. He hired a medium named Edward Kelley and the two of them spent years conducting elaborate séances, recording what they claimed was an angelic language called Enochian.
Here's what's interesting: Dee didn't see a contradiction between the math and the angels. To him, it was all one project. Understanding the hidden structure of the universe. The arcana was the point -- all of it, the rigorous and the insane, piled together in one enormous library that he kept meticulously catalogued.
The library was eventually ransacked by a mob while he was traveling. They destroyed a huge portion of it. He died in poverty. Rough end for a guy who just wanted to know everything.
Athanasius Kircher
Kircher gets called "the last man who knew everything," which is generous, because a lot of what he "knew" was wrong.
He was a 17th-century Jesuit who published something like 40 books on topics including: magnetism, Chinese civilization, Egyptian hieroglyphics, music theory, geology, optics, plague medicine, and the construction of the Tower of Babel. He built one of the first natural history museums in Europe. He claimed to have decoded hieroglyphics (he hadn't -- it took another 150 years and the Rosetta Stone to actually do it). He drew beautiful, detailed diagrams of the Earth's interior that were completely made up.
But the scope. The man just kept going. Every new topic was a new rabbit hole, and he dove in with full confidence and zero self-doubt. You almost have to admire someone who can be that consistently wrong and that consistently productive at the same time.
Kircher is the patron saint of arcana collectors who don't let accuracy slow them down.
Aby Warburg
Warburg is less famous than the others, which is appropriate for someone whose whole thing was finding the overlooked.
He was born into the Warburg banking dynasty -- yes, that Warburg family -- and as the eldest son, he was expected to take over the bank. Instead, legend has it, he made a deal with his younger brother Max at age thirteen: Max would get the banking empire, and Aby would get unlimited funding to buy books for the rest of his life.
That's the best deal in the history of deals.
He used the money to build a library of about 60,000 volumes, organized not by subject or author, but by association. Books were shelved next to other books that related to them conceptually, even if they were from completely different fields. A book on Renaissance astrology might sit next to one on Hopi snake rituals, because Warburg saw a connection in how images carry meaning across cultures.
He called it the "law of the good neighbor" -- you'd go looking for one book and the book next to it would be the one that actually mattered. The whole library was designed for serendipity. For stumbling into arcana you didn't know you needed.
Warburg had a complete mental breakdown in 1921 and spent years in a sanatorium. When he was released, he gave a lecture on Hopi serpent rituals as proof of his recovery. The library survived him and became the Warburg Institute in London, where it still operates today.
The Pattern
So what do these people have in common?
Observation: none of them were specialists. They were all aggressively, almost pathologically interdisciplinary. Eco moved between semiotics, medieval history, and pop culture. Dee combined navigation, mathematics, and angel communication. Kircher just did everything. Warburg built a library that rejected categorization entirely.
Observation: they all had a kind of faith that the obscure stuff mattered. Not in a "this will be useful someday" way, but in a deeper sense -- that the weird, forgotten, overlooked knowledge was where the real insights lived. The mainstream stuff takes care of itself. The arcana needs a custodian.
Observation: most of them were considered at least a little bit crazy by their contemporaries. Which tracks.
The Internet Was Supposed to Change This
And it did, sort of. You can now go down a Wikipedia rabbit hole at 2 AM and emerge knowing an unreasonable amount about, say, the history of pneumatic tube mail systems in Paris. That used to require a Warburg-level library and years of dedication. Now it takes an evening and a browser.
But there's a difference between accessing arcana and collecting it. The old-school arcana collectors didn't just find this stuff -- they held it, organized it, connected it to other stuff, and carried it around in their heads for decades until the connections became second nature. The knowledge was theirs in a way that a Wikipedia binge never quite replicates.
And now with LLMs, the game changes again. You can ask a model to find obscure connections between 14th-century trade routes and Ottoman military strategy and get a pretty decent answer in seconds. The access is essentially infinite. But the compulsion -- the need to personally accumulate and organize and synthesize the weird stuff -- that's not something you can outsource. The arcana collectors weren't just after the knowledge. They were after the structure that emerges when you hold enough of it in your head at once.
I don't think you can train yourself to be one of these people. It's a temperament. You either feel the pull toward the obscure or you don't. But you can recognize them when you encounter them -- they're the ones who answer a straightforward question with a twenty-minute detour through something you've never heard of, and somehow it all connects, and you walk away knowing something genuinely new.
Good people to keep around. Terrible at dinner parties.